Is the trim sample-accurate?

Yes. We slice the underlying AudioBuffer at exact sample boundaries, so the cut is precise down to 1/sampleRate seconds (about 22 µs at 44.1 kHz).

Can I trim MP3 directly?

We decode the MP3 to PCM first, so the output is WAV (lossless). If you specifically need an MP3 output, use a native tool like Audacity or ffmpeg — browsers don't ship an MP3 encoder.

What does the waveform show?

The waveform is the selected region only. Each pixel column is a min/max envelope of the underlying samples in that bucket, so you see the shape of just the part you'll keep.

Can I preview the selection before exporting?

The waveform shows the length of your selection. A full preview player is on the roadmap — for now, export and play the WAV to verify.

Is the file uploaded?

Never. Decoding, slicing, and WAV encoding all happen locally in your browser via the Web Audio API.

What's the maximum file size?

Browser memory is the limit — typically a few hundred MB of decoded audio. For hour-long files, prefer a native editor.

Audio Trimmer

Slice audio precisely with start/end sliders — export WAV.

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See how it works

Watch a quick simulation of this tool in action — no file needed.

Audio Trimmer — in action

Drop an audio file or click to browse

1. Click the drop zone — pick an audio file (MP3, WAV, M4A).

How to use Audio Trimmer

Follow these steps — everything happens instantly in your browser.

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Step 1. Drop an audio file (or a video — we take its audio track).
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Step 2. The browser decodes it with Web Audio API.
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Step 3. Drag the Start and End sliders to select the range.
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Step 4. The waveform updates to show just your selection.
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Step 5. Click “Trim selection to WAV” to download the slice as 16-bit PCM WAV.